Mailing package and packaging method

Abstract: A package blank and a packaging method for wrapping flat articles, such as diskettes, cassettes and books. A flat sheet of paperboard or cardboard is provided with a rectangular mid-section (1) defined by four bending lines (3, 5), one along each side of the rectangle. The sections beyond the sheet bending lines (3, 5) provide two side flaps (2) and two end flaps (4). The side flaps (2) defined by the longer bending lines (3) have a total width which exceeds the width of the rectangular mid-section (1). An article to be wrapped is placed on top of the rectangular mid-section (1) of a flat sheet and the side flaps (2) are folded along the bending lines (3), on top of the article to be wrapped. The side flaps (2) include overlapping sub-areas (2a) which are sized into contact with each other, whereby the side flaps (2) are subjected to a flexural stress between the bending line (3) and the overlapping sub-areas (2a). Finally, the end flaps (4) are folded along the bending lines (5), and the folded end flaps (4) are sized against the outer surfaces of the side flaps (2).

Description: The present invention relates to an assembled package containing a flat article, such as a diskette, cassette or thin book, said package being made of a package blank comprising a flat sheet including a rectangular mid-section defined by four bending lines, one along each side of the rectangle, and the sections of said sheet beyond the bending lines providing two side flaps and two end flaps, the side flaps having overlapping sub-areas adjacent their longer edges and end sections adjacent their shorter edges, and the end flaps being attached on outer surfaces of the end sections of the side flaps, and the finished package having a border edge defined by said bending lines. The invention relates also to a method for wrapping a flat article such as a diskette, cassette or thin book in such a package. An assembled package as defined in the preamble of claim 1 has become known from US-A-3,648,932. The package disclosed therein is a light-weight expansible mailing envelope which is fabricated from a single blank of spun-bonded olefin sheet stock. The 90° inside corners at the open mouth of the envelope include radiust filets at the intersection of non-coextensive planes which the side gusset sections form with the front and back panels. Corner closure flap extensions are incorporated to increase the number of non-coextensive planes at the open end of the envelope. Due to this structure, the envelope is adapted to be expanded into box-like structure . GB-A-2 239 446 teaches a package having edge portions of V-shaped cross-section. This package is made also of plastics and has one edge which is permanently open so as to form a gripping nip at the periphery of a disk inserted into the package. An object of the invention is to provide an assembled package and a method for wrapping a flat article in such a package, which employ a package blank as simple and economical as possible and facilitating the automatic wrapping in highly protective package, free movements of the article being prevented without internal paddings. This object is achieved by means of an assembled package and a method as defined in claims 1 and 5. The invention will now be described in more detail with reference made to the accompanying drawing which is a plan view and shows schematically a packaging line and a package blank during various operations included in the packaging method. The package blank is intended for packaging or wrapping flat articles, such as diskettes, cassettes or thin books. The package blank is a flat sheet of paperboard or cardboard, including a rectangular mid-section 1 defined by four bending lines 3, 5, one along each side of the rectangle. The sheet sections beyond the bending lines 3 provide two side flaps 2 and the sections beyond the bending lines 5 provide two end flaps 4. The mid-section 1 is provided with an address window 6. Each flap 2, 4 provides a continuous, rigid surface area without any bending or folding cuts. Thus, the result is not a box-shaped package but the edge portions of a finished package will have a V-shaped cross-section and, thus, the article is not able to move towards the narrowing edge. This result can be achieved also by double bending lines 3 and 5 with the provision that the distance between bending lines in each pair of parallel lines is smaller than the thickness of a flat article to be packed. The side flaps 2 defined by the longer bending lines 3 have a total width which exceeds the width of said rectangular mid-section 1. The end flaps 4 may be short as such flaps are only needed for closing the flattened ends of a package. The end flaps 4 have a parallelogram shape and the longer of the parallel sides of the parallelogram adjoins the bending line 5 which separates the end flap 4 from the rectangular mid-section 1. Thus, the corners of a package will be neat. A station 12 contains two piles of stacked blanks. Vertical pins hold the blanks in piles. A suction pad conveyor carries one blank at a time to a loading station 10, including two loading sections 15 and 16. The first section 15 contains addressed invoice or other such forms 7 which are transferred by means of a suction pad advancer 9, 9a on top of the mid-section 1 of a blank. The blank is advanced further in the form of a flat sheet into alignment with the second loading section 16, containing a diskette, a cassette or a book 8 which is carried by means of a transfer gear 11 on top of the mid-section 1 to a position determined by a stop abutment 11a. In the loading station 10 as well as in folding stations 18 and 20 for the side flaps 2, 4, the advancing of a blank can be effected on top of a conveyor belt or a roller table. When a blank is carried from the loading station 10 to a folding station for the side flaps 2, a sizing nozzle 17 is used for spraying adhesive adjacent to the free edge of one of the flaps 2. The station 18 includes folding elements 19 for folding the side flaps 2, each along said one bending line 3, on top of an article to be wrapped and overlapping sub-areas 2a included in the side flaps adjacent their edges are pressed into contact with each other, whereby the side flaps 2 are subjected to a flexural stress between the bending line 3 and the sized overlapping sub-areas 2a. This is followed by deflecting the package advancing direction and the package is carried to the folding station 20 for the end flaps underneath sizing nozzles 21 spraying adhesive to the end flaps 4. Thereafter, the end flaps 4 are folded, each along said one bending line 5, and the folded end flaps 4 are glued against the outer surfaces of the side flaps 2. In this method, the area defined by the outlines of an article 8 to be wrapped must be substantially smaller than the rectangular mid-section 1 defined by said bending lines 3, 5 in order to provide the edges of a package with triangular pockets which protect the edges and corners of a package. On the other hand, the triangular shape of the edges prevent the article from moving in the package. The package blank must be made of relatively stiff paperboard, cardboard or corrugated cardboard. It may be cut to a desired shape either by punching from a stack of rectangular sheets or by cutting from a continuous web. The latter approach facilitates the formation of bending lines on the same run but is nevertheless slower than punching in a stack.

Claims: An assembled package containing a flat article, such as a diskette, cassette or thin book, said package being made of a package blank comprising a flat sheet including a rectangular mid-section (1) defined by four bending lines (3, 5), one along each side of the rectangle, and the sections of said sheet beyond the bending lines (3, 5) providing two side flaps (2) and two end flaps (4), the side flaps having overlapping sub-areas (2a) adjacent their longer edges and end sections adjacent their shorter edges, and the end flaps (4) being attached on outer surfaces of the end sections of the side flaps (2), the finished package having a border edge defined by said bending lines (3, 5), characterized in that the sheet is made of relatively stiff card board or paper board, that the outline of the article is substantially smaller than that of said rectangular mid-section (1), and that the edge portions of the assembled package are of V-shaped cross-section so that the thickness of the assembled package increases from the border edge towards the outline of the article and said side flaps (2) are subjected to flexural stress between its bending lines (3) and its overlapping sub-areas (2a). A package as set forth in claim 1, characterized in that the end flaps (4) are of parallelogram shape and the longer of the parallel sides of the parallelogram adjoins the bending line (5) which separates the end flap (4) from the rectangular mid-section (1). A package as set forth in claim 1 or 2, characterized in that the rectangular mid-section (1) is provided with an address window (6). A package as set forth in claim 1, characterized in that the bending lines (3, 5) each are a double line with the spacing between the parallel lines of the double line being smaller than the thickness of the flat article to be packed. A method for wrapping a flat article, such as a diskette, cassette or thin books in a package as defined in any of the preceding claims, in which method the article to be wrapped is placed on top of the rectangular mid-section (1) of the flat sheet, the side flaps (2) are folded, each along said at least one bending line (3), on top of an article to be wrapped, and overlapping sub-areas (2a) included in the side flaps are attached with glue into contact with each other, whereby the side flaps (2) are subjected to flexural stress between the bending line (3) and the overlapping sub-areas (2a), followed by folding the end flaps (4), each along said at least one bending line (5), and the folded end flaps (4) are glued against the outer surfaces of the side flaps (2). A method as set forth in claim 5, employing a package blank which is provided with an address window (6), characterized in that on top of the rectangular mid-section (1) is first placed an addressed invoice or a like form (7) and on top of that is placed an article (8) to be wrapped. A method as set forth in claim 5, characterized in that the package advancing direction is deflected by 90° after the bending of the side flaps (2) but before the bending of the end flaps (4).

Inventors: JANHONEN TARMO, JANHONEN, TARMO
Applicants: PUSSIKESKUS OY
Application year: 1994
Main classification: B65D75
IPC codes: B65B11, B65D75